[orca] Gecko: Don't do SayAll for URIs starting with "moz-extension"

[Joanmarie Diggs <joanied src gnome org>]

commit 3a12b718e0b840909fa82f7de882f90149417b7f
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Jan 28 22:26:16 2019 -0500

    Gecko: Don't do SayAll for URIs starting with "moz-extension"

 src/orca/scripts/toolkits/Gecko/script_utilities.py | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/orca/scripts/toolkits/Gecko/script_utilities.py 
b/src/orca/scripts/toolkits/Gecko/script_utilities.py
index 3fd9190e1..824456290 100644
--- a/src/orca/scripts/toolkits/Gecko/script_utilities.py
+++ b/src/orca/scripts/toolkits/Gecko/script_utilities.py
@@ -181,6 +181,10 @@ class Utilities(web.Utilities):
         if "self-repair.mozilla.org" in name:
             return True
 
+        uri = self.documentFrameURI(obj)
+        if uri.startswith("moz-extension"):
+            return True
+
         return False
 
     def canBeActiveWindow(self, window, clearCache=False):